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Decoding 128 barcode checkdigit

Question asked by michaelkirwan on Jun 11, 2017
Latest reply on Jun 13, 2017 by michaelkirwan

Hi All

I want to validate a 128 check digit in filemaker. RL549737982IE is an example of one such barcode. I know the check digit is the 2 (RL549737982IE).

can anyone explain how this number is derived at?.

 

I have tried every combination of ACCII characters I could thing of and I cant resolve it.

 

Regards ..... Mike

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